Combustion gas seal for injector

a gas seal and combustion gas technology, applied in the direction of hose connections, machines/engines, braking systems, etc., can solve the problems of reducing clamping force and degrading sealing performance, and achieve the effect of preventing abnormal deformation

Inactive Publication Date: 2006-02-28
NOK CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0021]Thereby, the inner peripheral surfaces of those portions, on which the tapered surfaces are not provided, function as stoppers whereby abnormal deformation is surely prevented.

Problems solved by technology

Also, load based on vibrations and heat causes reduction in the clamping force whereby a sealing performance is degraded with the passage of time.

Method used

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  • Combustion gas seal for injector
  • Combustion gas seal for injector
  • Combustion gas seal for injector

Examples

Experimental program
Comparison scheme
Effect test

first embodiment

(First Embodiment)

[0042]A combustion gas seal for injectors, according to a first embodiment of the invention, will be explained referring to FIGS. 1 to 5.

[0043]FIG. 1 is a schematic, cross sectional view showing a state, in which the combustion gas seal for injectors, according to the first embodiment of the invention, is attached. FIG. 2 is a schematic, cross sectional view showing a mating structure (a structure of an injector and a cylinder head), on which the combustion gas seal for injectors, according to the embodiment of the invention, is mounted. FIG. 3 is a cross sectional view showing the combustion gas seal for injectors, according to the first embodiment of the invention, with a part thereof broken away. FIG. 4 is a partially enlarged view of FIG. 1. FIG. 5 is a view illustrating a surface-pressure distribution.

[0044]A combustion gas seal 1 for injectors, according to the embodiment, serves to seal an annular gap between an injector 50 (outer periphery thereof) and a cy...

second embodiment

(Second Embodiment)

[0059]FIG. 6 shows a second embodiment. An explanation will be given to a constitution of the embodiment in the case where a U-shaped groove is provided on the combustion gas side end surface.

[0060]Since the other constitution and effect are the same as those in the first embodiment, the same characters denote the same constituents and an explanation therefor is omitted.

[0061]FIG. 6 is a schematic, cross sectional view showing a state, in which a combustion gas seal for injectors, according to the second embodiment of the invention, is attached.

[0062]In the embodiment, a U-shaped groove 11 opened toward the combustion gas side is provided over an entire periphery of a combustion gas side end surface of a combustion gas seal 10 for injectors.

[0063]Thereby, since pressure of a combustion gas acts on wall surfaces of the groove, surface pressures on the groove bottom portion of the attachment groove 51 of the injector 50 and the inner peripheral surface of the cylind...

third embodiment

(Third Embodiment)

[0066]FIG. 7 shows a third embodiment. An explanation will be given to a constitution of the embodiment in the case where a tapered surface is provided on a periphery of an inner-peripheral side end edge of the end surface on the combustion gas side.

[0067]Since the other constitution and function are the same as those in the first embodiment, the same characters denote the same constituents and an explanation therefor is omitted.

[0068]FIG. 7 is a schematic, cross sectional view showing a state, in which a combustion gas seal for injectors, according to the third embodiment of the invention, is attached.

[0069]In the embodiment, a tapered surface 21 is provided on an entire periphery of an inner-peripheral side end edge of the end surface on the combustion gas side of a combustion gas seal 20 for injectors.

[0070]Thereby, since pressure of a combustion gas acts on the tapered surface 21, component forces toward an outer peripheral side is generated and a surface press...

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PUM

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Abstract

A combustion gas seal for injectors having the function to prevent the leak of a combustion gas when the injector is mounted on a cylinder head of an engine, wherein the seal is made of a resin and the entire surface of the combustion gas side end of the seal is exposed to the pressure of the combustion gas. The seal exhibits improved sealing performance together with improved soundproofing effect.

Description

[0001]This is a nationalization of PCT / JP01 / 08999, filed Oct. 12, 2001 and published in Japanese.TECHNICAL FIELD[0002]The present invention relates to a combustion gas seal for injectors, intended for prevention of leakage of a combustion gas in a state, in which an injector is mounted on a cylinder head of an engine.BACKGROUND ART[0003]FIG. 18 is a schematic configuration showing a state, in which an injector is mounted on a cylinder head of an engine.[0004]In the case where an injector 50 is mounted on a cylinder head 60 of an engine, it is necessary to prevent leakage of a combustion gas from a neighborhood of a mount of the injector 50.[0005]Thus, washer-shaped seals 100, 101 are conventionally provided in two locations on the mount of the injector 50 as shown in FIG. 18 to prevent leakage of a combustion gas.[0006]The seals 100, 101 are formed from metal such as copper, or the like, and sealing is achieved by a clamping force Q (see FIG. 19), which is obtained by a fastening fo...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): F02F11/00F02M61/14F16J9/20F16J9/26F16J15/16
CPCF02M61/14F16J15/164F16J9/26F16J9/20F02M2200/858
Inventor NAKAYAMA, JUNICHIKAWABATA, MASAHIRO
Owner NOK CORP
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